U–Pb-(SHRIMP-II)-age of zircon from granites of Bolshoy Tyuters Island (Gulf of Finland, Russia) and the problem of the Ediacaran thermal event in the region

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Abstract

New data on the U–Pb age (SHRIMP-II) and trace element composition (SIMS) of zircons from granites of Bolshoy Tyuters Island (Outer Islands of the Gulf of Finland) are presented. The upper intersection of the discordia (1825±11 Ma) is taken as the age of crystallization of granites cutting through secondary quartzites, and thereby determines their youngest age. Subconcordant zircons located in the upper part of the discordia has growth oscillatory zoning and geochemical characteristics of zircons of magmatic origin. The age of the lower intersection of discordia and concordia is about 570 Ma, supported by the independent generation of zircons, represented by black in the CL domains and rims in magmatic zircons, which are characterized by increased contents of non-formula elements (light REE, Ca, P, Ti, Nb, etc. ), up to anomalous values. The most probable interpretation of the age of the lower intersection of discordia and concordia can be considered the Timan (Ediacaran) or Finnmark (Early Caledonian) thermal activation of the Fennoscandian Shield, previously established based on zircons from gneisses of the Kola series.

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About the authors

S. G. Skublov

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences; Empress Catherine II Saint Petersburg Mining University

Author for correspondence.
Email: skublov@yandex.ru
Russian Federation, Saint Petersburg; Saint Petersburg

E. N. Terekhov

Geological Institute, Russian Academy of Sciences; Sсhmidt Institute of Physics of the Earth, Russian Academy of Sciences

Email: skublov@yandex.ru
Russian Federation, Moscow; Moscow

N. B. Kuznetsov

Geological Institute, Russian Academy of Sciences

Email: skublov@yandex.ru

Corresponding Member of the RAS

Russian Federation, Moscow

A. B. Makeyev

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

Email: skublov@yandex.ru
Russian Federation, Moscow

L. I. Salimgaraeva

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences; Empress Catherine II Saint Petersburg Mining University

Email: skublov@yandex.ru
Russian Federation, Saint Petersburg; Saint Petersburg

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Supplementary files

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2. Fig. 1. Simplified geological map of Bolshoy Tyuters Island: (a) position among the Outer Islands of the Gulf of Finland; (b) map of the island indicating the location of sample GT-25 (1 – Quaternary deposits, sands, less often moraine; 2 – raised beach; 3 – secondary quartzites: in coastal cliffs (a), outcrops in the forest (b); 4 – granites: a – massif, b – dikes; 5 – structural elements; position of sample GT-25).

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3. Fig. 2. Images of a section of GT-25 granite in a polarizing microscope (with an analyzer, magnification 10, field of view size 4 mm). Mineral designations: Qz – quartz, Pl – plagioclase, Kfs – potassium feldspar, Bt – biotite, Ms – muscovite, Ttn – titanite.

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4. Fig. 3. Image of zircon grains from GT-25 granite in cathodoluminescence (CL) mode. Here and below, the numbers of analysis points coincide with Tables 1 and 2. The crater diameter is approximately 20 µm.

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5. Fig. 4. Graph with concordia for zircon from GT-25 granite.

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6. Fig. 5. REE distribution spectra for analyzed zircon sections from GT-25 granite, showing: (a) subconcordant and ancient ages; (b) moderately discordant age values; (c) strongly discordant age values.

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7. Fig. 6. REE and P ratio for analyzed zircon sections from GT-25 granite (here and in the figures below: 1 – ancient zircon; 2 – zircon from a subconcordant cluster; 3 – moderately discordant zircon; 4 – highly discordant zircon).

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8. Fig. 7. Ratio of Ca and U content in zircon from GT-25 granite.

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9. Fig. 8. Ratio of La content and SmN/LaN ratio for zircon from GT-25 granite.

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